AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 371

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

31.6.3.3
Figure 31-10. Asynchronous Start Detection
Figure 31-11. Asynchronous Character Reception
In synchronous mode (SYNC = 1), the receiver samples the RXD signal on each rising edge of the Baud Rate
Clock. If a low level is detected, it is considered as a start. All data bits, the parity bit and the stop bits are sampled
and the receiver waits for the next start bit. Synchronous mode operations provide a high speed transfer capability.
Configuration fields and bits are the same as in asynchronous mode.
Figure 31-12
Figure 31-12. Synchronous Mode Character Reception
Synchronous Receiver
Clock (x16)
Baud Rate
Sampling
Sampling
Sampling
Example: 8-bit, Parity Enabled 1 Stop
illustrates a character reception in synchronous mode.
Baud Rate
Baud Rate
Example: 8-bit, Parity Enabled
Detection
Sampling
Clock
RXD
RXD
Start
Clock
Clock
RXD
RXD
1
1
2
2
Start
samples
3
3
16
4
4
D0
D0
5
5
samples
16
6
6
D1
D1
7
Detection
7
Rejection
samples
Start
Start
16
8
0
D2
D2
1
1
samples
16
2
2
D3
3
3
D3
samples
4
4
16
5
D4
D4
samples
6
16
7
D5
D5
samples
8
16
9 10 11 12 13 14 15 16
D6
D6
SAM7S Series [DATASHEET]
samples
16
D7
D7
samples
16
Parity Bit
Parity
Bit
6175M–ATARM–26-Oct-12
samples
16
Stop
Stop Bit
Bit
Sampling
D0
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